锑电极-库仑滴定法快速测定壳聚糖脱乙酰度  

Rapid Determination of the Degree of Deacetylation of Chitosan by Antimony Electrode-Coulometric Titration

作　　者：鲁静[1] 贺晓莹[1] 剡根姣[1] 王璇[1] 

机构地区：[1]银川能源学院石油化工系,银川750105

出　　处：《理化检验（化学分册）》2016年第10期1127-1130,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家自然科学基金(21463020);"十三五"宁夏回族自治区优势特色学科(化学工艺)建设(宁教高办[2015]110号);宁夏回族自治区能源化学工程重点专业子项目(宁教高[2016]98号)

摘　　要：为了克服pH玻璃电极在浑浊、黏稠的壳聚糖溶液中响应H+活度滞后的缺陷,提出了采用锑电极作为指示电极和钨电极作为参比电极的指示电极对指示滴定终点的库仑滴定法快速测定壳聚糖脱乙酰度的方法。壳聚糖滴定可在5min左右完成。分别分析了5种壳聚糖样品,测定结果与核磁共振氢谱法的测定值接近。To overcome the weakness of glass electrode in response lag to H＋-activity in turbid and viscous chitosan solution, antimony electrode was used as indicator electrode forming an indicator pair with tungsten electrode as reference electrode in the rapid coulometric titration of degree of de-acetylation of chitosan. The titration of a chitosan sample was completed within 5 min. The proposed method was used to the analysis of 5 chitosan samples. Results of degree of de-acetylation of chitosan found by this method were quite close to those found by 1H-NMR.

关 键 词：库仑滴定法 锑电极 壳聚糖 脱乙酰度 

分 类 号：O657.12[理学—分析化学]